清空筛选条件
清空筛选条件

simulink random sequence generation

2 次查看（过去 30 天）
amin re
amin re 2013-6-20
Hi,
I just created a "Malab function" block in simulink, and it generates random numbers. The problem now is that the sequence repeats whenever I run the simulation. The matlab function block simply looks like this function y=fcn() y=randn;
i know the seed should be reset but not sure how. Thanks

请先登录，再回答此问题。

回答（3 个）

Kaustubha Govind
Kaustubha Govind 2013-6-20
According to the documentation for randn, you need to use the function rng to control the seed, etc. You may want to look into that.
Shashank Prasanna
Shashank Prasanna 2013-6-20
编辑：Shashank Prasanna 2013-6-20
Random numbers in all software are pseudorandom sequence of numbers. As Kaustubha already mentioned you will have to seed your random number generator differently if you don't want reproducibility (Which would be required if you want to run the simulation in the exact same way)
Include the following command at the very beginning of your matlabfunction block:
rng('shuffle')
This will choose a random seed every time.
http://www.mathworks.com/help/matlab/ref/rng.html
amin re
amin re 2013-6-21
编辑：amin re 2013-6-21
Note that I'm using a matlab function block in a simulink, that doesn't work when I use rng shuffle in the function. so basically it looks like
function y=fcn()
rng shuffle
y=rndn
however i get this error The 'shuffle' input is only supported for Mex targets with the ExtrinsicCalls option.
  1 个评论
Kaustubha Govind
Kaustubha Govind 2013-6-21
Amin: Do you plan to generate standalone C/C++ code from your model? If not, you can call the function by declaring it extrinsic as the error suggests:
function y=fcn()
coder.extrinsic('rng');
rng('shuffle');
y=rndn;

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Sources 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by